Dell OEM Inspiron 14R 5421 and 3421 USB IO Circuit Board, part numbers WNR69 and YJP8J, is a replacement component designed to restore or enhance the functionality of your laptop's USB ports. This circuit board manages the input and output operations for the USB interfaces, ensuring reliable connectivity for external devices such as flash drives, mice, and keyboards. Essential for repairs or upgrades, it ensures that your Dell Inspiron 14R 5421 or 3421 continues to operate efficiently and effectively, maintaining seamless peripheral integration.